When they are old enough to see over the dashboard (12)
the child should be at least 9 to ride in the front seat
5
Five years old.
13
13
There is not an age to sit in the front seat the child just has to be 4 feet and 8 inches tall and weigh at least 85 pounds. At least in MA!
the legal height and weight is 4'10 and 92 pounds
12
10 years
12 years old or older can sit in the front seat in the USA
In the state of Illinois, a child must remain in the back seat until age 12. Even then it is not recommended that they ride in the front seat because they could be seriously injured or killed if the air bag opened.
In the state of Ohio, you only have to be 8 years of age to ride in the front seat. But if you reach other standards your child will have to remain in the back passenger seat. To sit in the front, your height needs to be 4'9" or taller. In weight you must be over 60 pounds.